<template>
  <el-upload
    class="avatar-uploader"
    action
    :show-file-list="false"
    :on-success="handleAvatarSuccess"
    :before-upload="beforeAvatarUpload"
  >
    <img v-if="value" :src="value" class="avatar" />
    <i v-else class="el-icon-plus avatar-uploader-icon" />
  </el-upload>
</template>

<style>
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409eff;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 178px;
  height: 178px;
  line-height: 178px;
  text-align: center;
}
.avatar {
  width: 178px;
  height: 178px;
  display: block;
}
</style>

<script>
export default {
  props: {
    value: {
      type: String,
      default: ''
    }
  },
  created() {
    console.log(this.value)
  },
  methods: {
    // 上传成功的回调
    handleAvatarSuccess(res, file) {
      this.imageUrl = URL.createObjectURL(file.raw)
    },
    // 检查函数 检查要上传的img图片大小后图片类型
    beforeAvatarUpload(file) {
      const isJPG = [
        'image/jpeg',
        'image/png',
        'image/gif',
        'image/bmp'
      ].includes(file.type)
      const isLt2M = file.size / 1024 / 1024 < 5

      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG png gif bmp 格式!')
      }
      if (!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 5MB!')
      }
      return isJPG && isLt2M
    }
  }
}
</script>
